Hi, the image isn't giving away much - we see something reports a Segmentation Fault but we do not know what or why. I've run similar guests on a few EPYC CPUs that are similar but not the very same. I have right now no access to the same chip you refer to, so I need to ask you to check a few more things.
More detail please: 1. What exactly crashes here ? Since we get more output after the segfault I doubt it is qemu. Is it systemd in the guest - is it a guest process at all? I see "tr" failing, is it just that or more guest processes? What else can you say about it? 2. what exactly is the configuration of the guest, could you share e.g. `virsh dumpxml <guestname>`? 3. could you attach logs as text files instead of images please. For example the guest log in /var/log/libvirt/qemu/<guestname>.log that might help as well. Check alternatives, to see what makes a difference Try those and let us know if it makes any difference. 1. I see you use 4.15.0-154-generic on Bionic, you could try the HWE kernel [1] 2. you could try a newer virtualization stack like server-backports [2] 3. you could upgrade your 18.04 system to 20.04 proper and give it a try 4. Vary your guest definition, if you use host-passthrough use something more compatible like qemu64 as cpu type (or vice versa). If you have plenty of extra features enabled, try disabling them. 5. You tried a 20.04 guest, could you try other guest versions and also not only the ISO, maybe the more commonly used cloud images [3] 6. various combinations of the above [1]: https://wiki.ubuntu.com/Kernel/LTSEnablementStack [2]: https://launchpad.net/~canonical-server/+archive/ubuntu/server-backports [3]: http://cloud-images.ubuntu.com/daily/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1941844 Title: KVM ubuntu 20 VPS on Ryzen 9 5950X with Ubuntu 18.04 on Host is failing to boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1941844/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
